​Arsenal will be without Kieran Tierney for up to three months after he dislocated his shoulder during their 3-1 win over West Ham on Monday night. 

Tierney arrived at the club from Celtic in the summer for a fee of around £25m and has had an injury plagued start to his Premier League career - making just five appearances in the competition so far.

It took the Scotsman until late September to make his Gunners debut due to a hip problem and Tierney's latest injury is likely to keep him out for an extended period of time too. 

​Sky Sports are reporting that the left-back's current issue is set to keep Tierney out until March. He will have surgery on his shoulder next week before starting a rehabilitation period of around three months. 

Kieran Tierney

The 22-year-old missed Arsenal's unconvincing 2-2 draw against Standard Liege on Thursday night and he is also ruled out of the Gunners game against ​Manchester City on Sunday. 

Also ruled out of this weekend's fixture are Granit Xhaka and Hector Bellerin. Xhaka suffered a concussion against the Hammers while Bellerin will be prevented from taking part by a tight hamstring.

One player who is likely available for selection is Nicolas Pepe, who is poised to shake off a bruised knee in time for Sunday's game. 

Going into this weekend's fixtures, the Gunners were seven points adrift of the ​Champions League places and they remain without a manager after the sacking of Unai Emery.

Fredrik Ljungberg

Freddie Ljungberg is currently in interim charge of the team but it is unlikely that he would get the job on a permanent basis. 

Brendan Rodgers rebuffed Arsenal's approach - recently signing a new contract with Leicester - and it is said that Manchester City assistant manager ​Mikel Arteta their top choice for the role.

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